Answer
What can I use a garden room for?
Office, studio, gym, yoga or quiet room; built properly, it is a year-round space, not a summerhouse.
In short
Almost anything that benefits from dedicated, year-round space away from the house: a home office, a studio for art or music, a gym, a yoga space, or a quiet room. Built and insulated properly, it is usable in every season, which is what separates it from a summerhouse.
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